Characteristics of $\textrm{Al}_2\textrm{O}_3$-SiC Composite Powder Prepared by SHS Process and its Sintering Behavior

The -SiC composite powder was prepared by Self-propagating High-Temperature Synthesis(SHS) process using Al and C powders as raw material. The effects of the molar ratio in raw material, compaction pressure, initial temperature of reactants on the products and combustion process were studied. Self-propagating high temperature synthesis of /Al/C system should be preheated above owing to the low combustion temperature. As the result of the combustion reaction, the purity of final product became better than that of reactants. In this system, the optimum molar ratio of :Al:C was 3.0:4.0:6.0. The free carbon was removed by roasting at for 30min. In this study, pressureless sintering was very dffective both for controlling the disintegration of specimen with powder bed and for obtaining dense sintered-body at . The sintered-body produced with hot-pressing was about 98% of the theoretical relative density.